Bộ 20 đề ôn thi vào Chuyên Anh năm 2023 có đáp án (Đề 6)

After a while people started to use boards and rode the waves by lying, kneeling or standing

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After a while people started to use boards and rode the waves by lying, kneeling or standing (9)______ them.

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Giải thích

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